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OVERVIEW
CHAPTER1 OVERVIEW
This manual describes the specification, function, preparatory procedures before
operation, programming, and troubleshooting of the following data link module (hereinafter
referred to as a local module).
• A1SJ71AP23Q type MELSECNET local station data link module
• A1SJ71AR23Q type MELSECNET local station data link module
• A1SJ71AT23BQ type MELSECNET/B local station data link module
When applying a program example introduced in this manual to the actual system, make
sure to examine the applicability and confirm that it will not cause system control
problems.
The local module can mount the Q series programmable controller as a local station in the
second tier or local station in the third tier of the MELSECNET or MELSECNET/B data link
system.
Mount the local module to the following base unit.
• QA1S5 B extension base unit
• QA1S6 B extension base unit
POINT
(1) This manual describes necessary information to add or replace a Q series
local station in the MELSECNET or MELSECNET/B data link system.
For the details of the MELSECNET or MELSECNET/B data link system, refer
to the following manual.
Type MELSECNET, MELSECNET/B Data Link System Reference
Manual.
(2) Where there is no difference between Q series and L series, the description is
given for Q series only; substitute "Q" with "L" where appropriate.
Figure 1.1 MELSECNET or MELSECNET/B data link system
MELSECNET (II)
Local module
Q series programmable controller
(Main base unit)
Master station
Local station
Local station
Q series local station
(QA1S5 B extension base unit or
QA1S6 B extension base unit)